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The deficiency indices and spectrum associated with self-adjoint differential expressions having complex coefficients. (English) Zbl 0238.34031

Conf. Theory ordinary partial diff. Equ., Dundee/Scotland 1972, Lect. Notes Math. 280, 241-245 (1972).

MSC:

34L99 Ordinary differential operators
34E05 Asymptotic expansions of solutions to ordinary differential equations